Editing JavaScript/JScript (section)

====Subjects====
In addition to Observables you can send to a Subject. A subject you can subscribe to it '''and''' you can use it to broadcast to other subscribers any time and anywhere in code. The only place you can broadcast data from observable is inside its constructor.
=====BehaviorSubject=====
Observable is a Generic, and '''BehaviorSubject''' is technically a sub-type of Observable because BehaviorSubject is an observable with specific qualities:
* It needs an initial value as it must always return a value on subscription even if it hasn't received a <code>next()</code>
* Upon subscription, it returns the last value of the subject. A regular observable or subject only triggers when it receives an onnext
* at any point, you can retrieve the last value of the subject in a non-observable code using the <code>getValue()</code> method.
* It is an observer in addition to being an observable so you can also send values to a subject in addition to subscribing to it.